2
此代码有什么问题?编译器说有两件事情,即没有运行条目,并且运行接受不匹配条目(两者似乎都是错误的),并且单独指出在声明之前不能使用Train(但它已被声明)。请向我解释发生了什么事。Ada对象“火车”在声明结束前不能使用
我很犹豫要显示整个代码,但可以这样做。
type ItineraryType is array (0..255) of Integer;
type Train is record
Label : Integer;
Capacity : Integer;
Maxspeed : Integer;
Starts : Integer;
Itinerary : ItineraryType;
Stops : Integer;
lock : access Mutex;
end record;
task type TrainThread is
entry Run (train1:Train);
end;
task body TrainThread is
train : Train;
begin
accept Run (train1:Train) do
train := train1;
end;
end;
-- part of main
train1 := new TrainThread;
train1.Run(trains(i));
main.adb:51:05: warning: no accept for entry "Run"
main.adb:52:17: object "Train" cannot be used before end of its declaration
main.adb:54:09: no entry declaration matches accept statement
gnatmake: "main.adb" compilation error